Beware of unscrupulous EBAY sellers trying to sell KCHO fakes. They are trying to represent their paintings as authentic with a bogus Certificate of Authenticity. KCHO usually will take his picture with the painting to show that it is real.
Ask the seller to furnish a picture of KCHO with the painting. I assure you they will not provide it because they don't have it nor can they manufacture a fake.
Also, the signatures on the EBAY KCHO paintings are terribly done. E-mail me at (((email redacted))) if you have any more questions.